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Python String | isupper () method

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Python has many helper functions in its libraries that always help us with some day to day tasks. Let’s see how the string isupper () method works which actually checks if all characters in the string are uppercase.

Syntax: string .isupper ()

Parameters: None

Returns: True if all the letters in the string are in upper case and False if even one of them is in lower case.

Code # 1: Demonstration of isupper ()

# Python3 demo code
# isupper () working

# initialization string

isupp_str = " GEEKSFORGEEKS "

not_isupp = " Geeksforgeeks "

# Check which line
# in all caps

print ( "Is GEEKSFORGEEKS full uppercase? : " + str (isupp_str.isupper ()))

print ( "Is Geeksforgeeks full uppercase?: " + str (not_isupp.isupper ()))


 Is GEEKSFORGEEKS full uppercase?: True Is Geeksforgeeks full uppercase?: False 

Practical Use: This function can be used in many ways and has many practical uses. such applications to check uppercase, check abbreviations (usually uppercase), validate a sentence that requires all uppercases. Below is a small example demonstrating the isupper () method.

Code # 2 : Demonstration of isupper ()

# Python3 demo code
# using isupper ()

# check abbreviations.
# short form of work / phrase

test_str = "Cyware is US based MNC and works in IOT technology"

# line splitting

list_str = test_str.split ()


count = 0

# counting uppercases

for i in list_str:

if (i.isupper ()):

  count = count + 1

number of print abbreviations

print ( "Number of abbreviations in this sentence is:" + str (count ))


 Number of abbreviations in thi s sentence is: 3 


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